springcloud版本：Finchley.SR2
springboot版本：2.0.7.RELEASE

1.@EnableFeignClients @FeignClient注解找不到问题

问题原因： finchley版本feign相关jar包在openfeign包中
解决方案：pom.xml增加相关依赖

<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

2.配置好feign相关注解后，项目启动时OpenFeign模块报错

异常信息：

org.springframework.beans.factory.BeanCreationNotAllowedException: Error creating bean with name ‘eurekaAutoServiceRegistration‘: Singleton bean creation not allowed while singletons of this factory are in destruction (Do not request a bean from a BeanFactory in a destroy method implementation!)

问题原因：openFeign里不包含tomcat的依赖，导致spring容器无法创建一些实例，导致项目无法启动。
解决方案：pom.xml中增加web依赖

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
</dependency>